Move old 2011 site to a sub-domain or subfolder?

I'm using Revo.

Does anyone know how to do this?
I read some old posts and it seems in the older Evo you could export site as HTML put the files into a folder called 2011 and just make sure that everything linked.

I can't find this export functionality in Revo. Has anyone done this?... anyone have some suggestions?

Whats the best way to move an old site into an archive. I've seen people use sub-domains like 2011.mywebsite.com

Whats the quickest easiest way to archive? and what's best practice?